Heel of a shoe sole



FIG. 1 is a bottom plan view of a heel of a shoe sole showing our new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof; and,

FIG. 4 is a rear view thereof.

The broken lines in the Figures show portions of the shoe upper and sole which form no part of the claimed design. 

The ornamental design for a heel of a shoe sole, as shown and described. 